Fuel-pump.



H. SCHRECK.

FUEL PUMP. APPLlCATlON fILED MAY 22. 1915.

Patfit1 NOV. 21, 1916.

r ments in. fuel-pumps;

UNITED STATES PATENT OFFICE.

HENRY SGHRECK,- OF ST. LOUIS, MISSOURT rump-PUMP.

To all whom it may concern:

' Be it known" that I, HENRY SGHREGK, a

subject of the Emperor of Germany, resid- State of Missouri, have iningat-St. Lou s, vented" certain new and useful Improvements in Fuel-Pumps, of which the follow in is a full, clear, and exact description, re erence being had to the accompanying ra-Wings, forming av part hereof.

My invention has relation to improveand it consists in the novel features 0t construction more fully set forth in thespecification and pointed out in the claims.

The present invention is primarily direeted (though not restricted) to fuel feedpumps for internal combnstion engines and particularly what are'known as slow combustion or high pressure internal combueignited tion engines in which liquid fuel' is by the high temperature of the compressed air charge present in the cylinder.

The objc-ctof thei invention is to provide a pump, the fuel-feed whereof maybe automatieally regulated and controlled accord.

ing to the load imposed on the engine, with a view of maintaining the speed of the engine approximately uniform under variable load conditions. .fThe-pump hereinis of the reciprocating piston or plunger-1 type, the fuel being drawn into the pump cylinder with a stroke of theplunger in one direction, and expelled from the eylinderwith a stroke 'of said plunger in the opposite directionthequantity thus expelled being fed" automatically and-directly affected by the to said load.

load "imposed on the engine, thestrolces iiicreasing and decreasing in direct proportion lhe independent control over the 'ilunger whereby the stroke thereof is susceptible of. variation according to the load imposedon the engine, is made possible under "my invention by interl'iosing a yielding conncction between said plunger and its Specification iii Letters Patent.

PaitentedNov. e1, 1916.

Application filed May 22, 1915. Serial No. 29,8Qd.

cooperating complementary member (the strokes of -which are constant), the controlling element for the' plunger being operatedby the engine governor or by any movtions.

Jig-further object is to provide a feed regulatmg pump which is susceptible of many modifications without a departure from the underlying principle of the invention one which. is equally applicableto engines of one able-member responsive tofthe load condiso cylinder or b the multicylinder type; one A which is positive and reliable, comparatively simple in construction, and one iossessing ent'from th lfpllowing detailed description of the invention illustrated in'the accomp'anying drawings in whioh--- Figure 1. represents an endfleleva-tio'n of an' internal combustion engine showing one form of my invention'a-pplied thereto Fig. 2 1s a longitudinal middle vertical section of the pump shown in Fig. 1; Fig. 3 is a. horizontal section on the zigzag lino 3-3 of.

" further andt'other advantages bet r appar- Fig. 2; Fig. 4 is a vertical cross-section on the line 4.i of Fig. 2; Fig. Iris a vertical sectionon the order of Flg. 2 showing amo'clification of my invention; Fig.6 is -a end elevation oi Fig. 5; Fi n- 7 is an enlarged vertical cross-section on the line 77 of Fig 5; Fig; 8 is an enlarged vertical cro's ssectional1letail on the line 8-8 of Fig; 5; Fig. 9 .a front elevation of a further modification of pump havingindependently springcontrolled pl'ungers, parts being-in section;

and- Fig. id is a combined side elo 'ation and vertical sedtion' on the zigzag line 10 10 of Fig. 9.

Reterringto the drawings, and-for the present to Figs. 1 to 4E inclusive, E represents the upper portion of a convention-ah internal combustion engine,.and S the gearshaft carrying the governor (l which con trols the sliding collar 0. 1 represents the" pump body the pump to the stood in the art. above the collar 6 which leads the. eccentric/link 2, the opposite atomizer, all as well under Disposed on the shaft S is an eccentric 1 from and a, theoil line leading from end oi said link being pivotully coupled by 9 means of a pin (.4 to a piston head 3 operating in a hearing or cylinder l'of the pump body, the piston' bead being provided'with an intermediate reducedportion from which in turn liiads-th'c still further reduced portion or stem 3", an annular shoulder .9 being formed between the members 31 3. The stem 3 operates looselythrough one of the end walls of a reciprocating sleeve or housing 5 suitably mounted and guided in the pumphody, the inner end or the stein terminating within the housing and being provided with a reduced screw terminal 6 carrying-a nut nnvhich secures to the stein a disk or washer 7 bearing against the end of the stem, said diskforming an abutment for the, adjacent end of an expansion'spring 8 coiled about the stern and interposed between the disk and the terminal with of the housing traversed by said stem. The opposite end wall of the housing isprovided with laterallyprojeeting ledges 9 for a purpose presently to appear, said ledges and wall forming in effect a terminal cross-piece to which the plunger-s 10 are secured .inian) suitable niechanii'ral manner. It may he stated in assing that the spring 8 normally tends to area or drive the sleeve. or spring housing 8 against the shoulder aof the pieton section 3, ermitting the piston head 3 and the housing 5 under certain uoiiditions tflhe hereinafter specifically. referred to) to reciprocate as a unit under the driving action of the'e'cceutriel. Theconnection hetween the stem 3 and the sleeve or housing is-a 'telescopie "DQ741113 member 5 but mg "susceptible of control independently of the reriprocat ions of the piston head 2-}, the.

strokes of \vl irh are ronstant because of its ronneotion with the gear-shaft S through the .rrrentrie '1. These'veral hlungere 1,0

(Mu-re more than one plungerare used, as' \vouhlhe the case with -a multu'yluuler en gin'e) operate through suitable stallinghokes ll on the pump body, theplungers rrriproratiup in passage-ways l! \vhirh in eti'eot ronstitutrrylunirrs tor the planners.

said pump r \'lindrr or passage-nave (our amini ratingr varh with a port o lradingto a rhaniher ll \vhirli ounuluiiratrs on the one 'hand with a naa rollt-rting or distributing llzlll! an H to, whirl: the fuel is" initially ll0- live'rcd hy tlir-fia-d-pi w. [5 leading: from any suitahl': :zourru ol fuel or oil eupply (not shown) and on the other hand with ava lvwmusing I6, rarh (-liaiula-r I? heme oo'ntriilhal hya cheek valve interposed hrtwrrn it and the rhamhor ll. and rarh raising ll; hr-

ingiprovidod with a (hook valve the oil lnfe'ur'leading' from the valvr-rasmg Hi to its res i'evtive oi'igino r \-'li.ndrr. or more partirucyliruler, The valve V is normally sri i f by a a spring 17. and the valve Y lav pring 18 the valve- V alienating \vitha surtion'ur in tnlto strolnol" the; plungvr lll to- .adinit liquid fuel into the pumpirylindrr 12, and

seating with art expulsion or disrhargo stroke and tho val\r-\ uxl-iulionh'trolna hnti loaing ,a-ilh unma- IinSrating'uith the take or suction stroke of the-plunger. These are matters well understood in the art and no claim therefor-is inadeherein, it being within the l'iurvieavofthe skilled mechanic to substitute some othe tisystem ofv check 7 valveash'ould he deem it-desira'ble or'necea r. 1

Pivoted on opposite sides of the pump body P at the ends or Suitable arms or hraeh'ets 19, directed to' vardi:the gear shaft S, a re hunt levers 20=wh0se shortfnrms are pivotallycoupled m theslidingcollar Q, the end of. the long arm ofeaeh lever being" pit otally secured to the adjsietitndofja link 21. whose opposite end*pinotaliyieonnects 80 t with the outer end bf'anaiseilliitin'g-arm 22 leading from the adjaeeu terminal. of a rock-shaft or rocker spindle 23 carried by an arm orbraoket 24 leading fr'omthe pump body, the inner terniiniils ,ofitl'ie' rock-shafts being provided with suitable Icains25 or their equivalent) a'dated t'd" engage the adjacent faces of the edges tl -the oams'or their equivalents operating =ponjointly as quite obvious from tlie'dra'vringgj' v 1 The ,op'vrat ion of the' puin isj 'subsitantially as follows: {Rotation'ot'theshaft S necessarily.iinpa'rts reeipr' mom-. 1 the 'pis- ,1 3" ;jand so long as the-housim 1O are sobured iLs I vouate (-onjointlynrid- Goes nimnheuii, 'licixi helt' )riug H nhit'lflinlds' th t e slu'allder a t 3'. Assume howev rngine'liglitrns a) i the ehaft'h. 'l lie rollar-G,av lntothn ltniers'filflt thfidott rated in Fig. 2,;ithdhiii the positions oi the par 7 rated; and ia'mki'n'gor 'rptatni in a dirdetion'to livar a a I and thus interrupter if.

1 as indithe-11a ms 2-) the: ledges, S)

full intake or suq t ikme her it). The vo'nsu no tion stroke of ti suction trokes l there are 'n'ioro than or q 7 shmtrl' thantherorrespondin rrl'iti'irl 1; the luulsin shoul lrr a. (on spring: Shring u The a lili ou'nt of in of art-eat: off-the;

der 5% selyving asan abutment, for one end of an expansion spring 55 whose opposite end bears against the hnllow screw plug 56 through which the plunger operates, Said plug closing the outer end nfthe chambef. In this nmdificution the eccentrics 57 (or their equivnlents) are distributed along .5.

rock-shaft 58 (on the o1'cler of the; rockshaft' 23 described in connection with'the first form) terminating in'lever arms 59, which are eon'trnlled by levers (not shown) pivntrd to the arn1s 6 0 ,,th e levers being cannected to t 1e collar C or itemmiv'abnt as in the first ferm described. Itflvillfhe seen from the-connections deserihed that- .'a rotation of theeu'centries 5? in'pi operj-diiiection will force down the pl un'ger s fimthet-is to say, cause their arrest at aigi ven peintl of their upstroke while. the member-515m a1- lowed to 'rhake its full stroke withthe his- .ton When the eccentrics-57 110 not asconfurm to the londimpesedfo'n "the er'igine,

and whereby the qli:int-it ,":of-fnl delivered to 'the engineimil l loa'dso as to m. ntalnkanf uppifdximately uniformspeed under all conditions;may be mudified still fn'rther,.but theexziinpl is here shown-ate sl flicient tn indiczi' te th'at myflnventinn 'is' Ieuseeptihle nf many"i'znhitirihsi in details w thout Involving a departure from either" the spirit hr nature nfthe in ention. The member 5 (,with its plnngeraml may he (l( lll Sl[.lQll!(l its the 'emn )"1enient' '01 the cylinder '12 is availed of,"the sitmhesbfthe ember i) being in :ulditiun Si'istc-ptible xif.' Y variation anil tontz'plby themen ilx under which the 'Full enpnnityhf;the

20 0! any eqi'livnlent' thereof i'iisptm'ding tnflnad 'Imt'nllmled tnenfm-ithmwell umlei-sh'ierl 'in the -m-t ur fnll within the pu'i'vie'w,iif'the hklllfll llll'flllilllltt, and a deseriptmn-thereof )e prdpoi'tionedjto siiii'l all; pthei mite Having described: my inventiqn what If claim is: i 1

1.-;In cembination with the gentshaft of ant-Internet eembustion engine, a speed g0velnozbn' said shaft, n smu'ee. or liquid fuel su'pp1y,; a feed pump provided with a cylin telese'o'picully. 'e'r'mnected to the p meansinterpesed between the said com lementm-y merfiber. or im pmti ng tothe" utter rec'iprocu-tions bfconstant streke, land h eafns "cont'x' olled by th'e govv gar," ar-shaftund;

der hi ying' reeiprocatihg phinget therein,j

a cemplenientary member yieldinglly and enter-for contrbllin'g theliptakels'trohe' of" a I the pllinger wlieieby.tlte qimntity Qffuel fed ,to the engine is regfilntgkh to suit the load, conditiqnsjmpmedonthe engine.

2. In: 'ctiinhinii'tinn ivith the gear shaft of 'anii1ternal eonibiletiolten'gine, a peed gm iii-n01- on gaid-shaft; a mciptociiting member ewmtin hnden .pohstunt" stroke and hctnated ii -om thegezur-lsh ft', a 'r nerpher telesc0ping' with, and movable lengltudina'lly being previder l with a ehkmlder for limiting the "movement of the telescoping m el'nlkm in i one rlilee'tim, an i hutment on s:iirl -"irecipre-' patinig'h1e1h her3 zi'gspring intei'pnsed between Gaul abutment-mitt the telescoping memberi pinnp plungezs ciu-ried by the telescoping memhel ',ian' Oscillating memberhet uabedlliy the epeedjgm'ernnr; iiind siiitnblej de'vicesihterpkis'ed between the tel'sccipi'ng nemher'and psi-illutin'ginieinheiaforesaid, foi" fereing'thej telescoping member uy;1y, from the shenlder' pf the -rei:ipr ic1 ting hiemher' against the tent'innsflmpose'il on the engine," whereby the strnkes' 'uf. the tales-fining member and of the plnngers CtllflL'lPd thereby 'm'uy' be vzu'ied according tg 'sz nid' conditions ihdeimmlently me nherfi- I 3. In epihhinnthni With-h: gait-Shaft at in (if the ,mnlstnntjsti'okes oftthe reeijmocztting. i

inter-mil:(Kniih nitiOn engine, t speed gav- 'ernm' -nn snid shaft, n'p'1'stmt11ehd, :in eecentru'; 0n thefshaft, au r eccentrnc-rorl, 01'

liiilg'mnnecting Ill] pisten'h ml'tn'the ec-.

ills of the sleeve my egims engaging tho inner faces of the ledges, feed-pump plunger-s carried bythe oross-piecea1ongthe outer face thereof, a pair of oscillating bent levers: pivoted at intermediate-points of their lengths one arm of a lever being actuated by the governor, and intermediate connections between. 'the opposite arm of the lever and its corresponding cam for actuating the latter and regulating the StlOm: of the. sleev ef and the plungers.

In testimony-whereof. I afiix my signature,

in presence of two Witnesses.

, HENRY SCHRECK. \Vitnsseg:

EMIL STAREK,

ELSE- M. SIEGEL. 

